CodeIgniter Image Uploader

<?php

class Photo_model extends CI_Model {

  private $photo_path;

  private $photo_path_url;

  public $result;

  public $photo_uploaded;

  function __construct() {

    parent::__construct();

    $this->photo_path = realpath(APPPATH . "public/img/");

    $this->photo_path_url = base_url() . 'application/public/img/';

    $this->result = "";

    $this->load->library('image_lib');

  }

  function do_upload() {

    // configure and copy the original size photo

    $config_original = array(

      'encrypt_name' => TRUE,

      'allowed_types' => 'jpg|gif|png',

      'upload_path' => $this->photo_path . '/original',

      'max_size' => 2048

    );

    $this->load->library('upload', $config_original);

    // if the upload is successfull! begin adding to db.

    if ($this->upload->do_upload()) {

      // initialize some data after upload

      $image_data = $this->upload->data();

      $this->photo_uploaded = $image_data;

      // make a better crop

      $result = $this->resize($image_data['full_path'], $this->photo_path . '/thumbs/' . $image_data['file_name'], '180','121');

      if ($result != 'success') {

        $this->result = $result;

        return false;

      }

      // configure and copy the thumbnail size photo

      // $config_thumb = array(

        // 'source_image' => $image_data['full_path'],

        // 'new_image' => $this->photo_path . '/thumbs',

        // 'create_thumb' => false,

        // 'maintain_ratio' => true,

        // 'width' => 180,

        // 'height' => 121

      // );

      // $this->image_lib->initialize($config_thumb);

      // $this->image_lib->resize();

      // configure and copy the preview size photo

      $config_preview = array(

        'source_image' => $image_data['full_path'],

        'new_image' => $this->photo_path . '/preview',

        'maintain_ratio' => true,

        'create_thumb' => false,

        'width' => 720,

        'height' => 720

      );

      $this->image_lib->initialize($config_preview);

      $this->image_lib->resize();

      // save photo details to database

      $this->set_database_info($image_data);

      return true;

    } else {

      return false;

    }

  }

  public function resize($oldFile, $newFile, $width, $height)

  {

    /*

    *    Resize image

    */

    $config['source_image'] = $oldFile;

    $config['new_image'] = $newFile;

    $config['maintain_ratio'] = TRUE;

    $config['master_dim'] = 'width';

    $config['width'] = $width + 2;

    $config['height'] = $height + 2;

    $this->image_lib->initialize($config);

    if ($this->image_lib->resize() == false){

      return $this->CI->image_lib->display_errors();

      die();

    }

    $size = $this->_get_size($newFile);

    unset($config); // clear $config

    /*

     *    Crop image  in weight, height

     */

    $config['source_image'] = $newFile;

    $config['maintain_ratio'] = FALSE;

    $config['width'] = $width;

    $config['height'] = $height;

    $config['y_axis'] = round(($size['height'] - $height) / 2);

    $config['x_axis'] = 0;

    $this->image_lib->clear();

    $this->image_lib->initialize($config);

    if ( ! $this->image_lib->crop())

    {

      return $this->image_lib->display_errors();

      die();

    }

  return 'success';

  }

  private function _get_size($image) {

    $img = getimagesize($image);

    return Array('width'=>$img['0'], 'height'=>$img['1']);

  }

  function get_photos() {

    $files = scandir($this->photo_path . '\thumbs\\' );

    $files = array_diff($files, array('.', '..', 'thumbs', 'original', 'preview', 'Thumbs.db'));

    $images = array();

    foreach ($files as $file) {

      $images []= array (

        'url' => $this->photo_path_url . 'preview/' . $file,

        'thumb_url' => $this->photo_path_url . 'thumbs/' . $file,

        'original_url' => $this->photo_path_url . 'original/' . $file,

        'file' => $this->get_filename_only($file)

      );

    }

    return $images;

  }

  function get_photo($id) {

    $this->db->select('*');

    $this->db->from('photo');

    $this->db->where('id', $id);

    $query = $this->db->get();

    if ($query->num_rows() == 1) {

      foreach ($query->result() as $row) {

        return $row;

      }

    } else {

      return 0;

    }

  }

  private function get_filename_only($filepath){

    $info = pathinfo($filepath);

    return  basename($filepath, '.' . $info['extension']);

  }

  private function get_file_ext_only($filepath){

    $info = pathinfo($filepath);

    return  $info['extension'];

  }

  private function set_database_info($image_data){

    $new_photo_insert_data = array(

      'id' => $image_data['raw_name'],

      'original' => $image_data['orig_name'],

      'extension' => $image_data['file_ext'],    

      'title' => $this->input->post('title'),

      'description' => $this->input->post('description')

    );

    $insert = $this->db->insert('photo', $new_photo_insert_data);

    return $insert;

  }

}